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An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen
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  1. A mass spectrometer method for determining helium in the parts-per-million to 10-percent range
    Personal Author:
    Holland, Philip W.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1991
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9359
    Description:
    "The U.S. Bureau of Mines has developed a mass spectrometer method for determining helium in the parts-per-million to 10-pct range to an accuracy of +/-1 pct. The method employs a mass spectrometer, an inlet system utilizing a chromatographic gas-sam...
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  2. Improved method for determination of helium-4 in helium-3 by mass spectrometry
    Personal Author:
    Burton, Samuel R. M.; Cornelius, David E.;
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    United States. Bureau of Mines.
    Published Date:
    1989
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9232
    Description:
    "This U.S. Bureau of Mines report describes a method for determining parts per million (ppm) of helium-4 (he-4) in helium-3 (he-3) to an accuracy of +/-5 pct by mass spectrometry. Gravimetrically prepared primary standards were used for the calibrati...
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  3. An improved analyzer for determining helium-4 in parts-per-billion range
    Personal Author:
    Seitz, Charles A.; Holland, Philip W.;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1986
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9010
    Description:
    "The Bureau of Mines has modified its parts-per-billion helium-4 analyzer to improve the analytical capabilities of the instrument. The modifications resulted in the following improvements: (1) the analytical precision of the instrument for 10 consec...
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  4. Method and apparatus for direct determination of helium-3 in natural gas and helium
    Personal Author:
    Davidson, Thomas A.; Emerson, David E.;
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1990
    Series:
    Report of investigations (United States. Bureau of Mines) ; 9302
    Description:
    "The Bureau of Mines Helium Field Operations has developed a method for determining the helium-3 (3he) content of natural gas and mixtures containing 0.5 to 100 pct helium. The helium is preconcentrated by passing samples through anhydrone, a liquid-...
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  5. An analyzer for determining helium-4 in the parts-per-billion range
    Personal Author:
    Holland, Philip W.
    Corporate Authors:
    United States. Bureau of Mines.
    Published Date:
    1984
    Series:
    Report of investigations (United States. Bureau of Mines) ; 8853
    Description:
    "The Bureau of Mines has developed a trace helium analyzer for determining helium-4 in the parts-per-billion range. The instrument is used for analyzing pure gases, laboratory-prepared standards, and atmospheric samples. Accuracy at the 95-pct confid...
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